package lambdasinaction.chap5;

import java.util.Arrays;
import java.util.Comparator;
import java.util.List;
import java.util.Optional;

import static java.util.Comparator.comparing;
import static java.util.stream.Collectors.toList;

/**
 * Created by ThinkPad on 2017/8/19.
 * 实践
 */
public class PuttingIntoPractice {
    public static void main(String... args) {
        Trader raoul = new Trader("Raoul", "Cambridge");
        Trader mario = new Trader("Mario", "Milan");
        Trader alan = new Trader("Alan", "Cambridge");
        Trader brian = new Trader("Brian", "Cambridge");

        List<Transaction> transactions = Arrays.asList(
                new Transaction(brian,2011,300),
                new Transaction(raoul,2012,1000),
                new Transaction(raoul,2011,400),
                new Transaction(mario,2012,710),
                new Transaction(mario,2012,700),
                new Transaction(alan,2012,950)
        );
//        找出2011年的所有交易并按交易额排序(从低到高)
        List<Transaction> tr2011 =
                transactions.stream()
                .filter(transaction -> transaction.getYear() == 2011)
                .sorted(comparing(Transaction::getValue))
                .collect(toList());
        System.out.println(tr2011);
//        交易员都在哪些不同的城市工作过
        List<String> cities =
                transactions.stream()
                .map(transaction -> transaction.getTrader().getCity())
                .distinct()//这里可以直接用collect(toSet());set是不重复的
                .collect(toList());
        System.out.println(cities);
//        查找所有来自于剑桥的交易员,并按姓名排序
        List<Trader> traders =
                transactions.stream()
                .map(Transaction::getTrader)
                .filter(trader -> trader.getCity().equals("Cambridge"))
                .distinct()
                .sorted(comparing(Trader::getName))
                .collect(toList());
        System.out.println(traders);
//        返回所有交易员的姓名字符串,并按字母顺序排序
        String tarderStr =
                transactions.stream()
                .map(transaction -> transaction.getTrader().getName())
                .distinct()
                .sorted()
                .reduce("",(n1,n2) -> n1 + n2);
        System.out.println(tarderStr);
//        有没有交易员是在米兰工作的
        boolean milanBased =
                transactions.stream()
                .anyMatch(transaction -> transaction.getTrader().getCity().equals("Milan"));
        System.out.println(milanBased);
//        打印生活在剑桥的交易员的所有交易额
        transactions.stream()
                .filter(transaction -> "Cambridge".equals(transaction.getTrader().getCity()))
                .map(Transaction::getValue)
                .forEach(System.out::println);
//        所有交易中,最高的交易额是多少
        Optional<Integer> highestValue =
                transactions.stream()
                .map(Transaction::getValue)
                .reduce(Integer::max);
        System.out.println(highestValue);
//        找到交易额最小的交易
        Optional<Transaction> smallestTransaction =
                transactions.stream()
                .reduce((t1,t2) -> t1.getValue() < t2.getValue() ? t1 : t2);//.min(comparing(Transaction::getValue));
        System.out.println(smallestTransaction);
    }
}
